Doesn't matter when you paid for HoW. Level 20 strikes are cake walks for a level 24 or higher. With no Heroic strikes or nightfalls, you're left with PoE for a challenge. And...well we'll just say there's been better content. The point is, Bungie didn't choose a great activites model for expansions. The issue is only compounded by the fact that there are no static loot activities except for the raids. I'm not sure if the raids will even give you xp when you play them now.